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G. F. TINKI-IAM.

SMOKE GONSUMI'NG FURNAGE. v No. 371,804. Patented Oct. 18, 1887'.

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GEORGE F. TINKHAM, OF CEDAR RAPIDS, IONVA, ASSIGNOR, BY DIRECT AND MESNE ASSIGNMENTS, OF PART TO A. M. PHELPS AND GEORGE B. PEOK,

BOTH OF SAME PLACE.

SMOKE-CONSUMING FURNACE.

SPECIFICATION forming part of Letters Patent No. 371,804, dated October 18,1887.

Application filed January 3, 1887.

.To aZZ whom it may concern:

Be it known that I, GEORGE F. TINKHAM, a citizen of the United States, residing at Cedar Rapids, in the county of Linn and State of Iowa, have invented certain new and useful Improvements in Smoke Consuming Fur naces, of which the following is a specification. The object of my invention is to render more perfect than hitherto the combustion of the fuel in steam-boiler furnaces, thus increasing the heating capacity of such furnaces and diminishing the production of smoke.

The invention relates to that class of smokeconsuming furnaces in which steam from the r 5 boileris introduced into the combustion-chamher; and the invention consists in certain i111 provements in the method of and means for utilizing the constituent gases in the steam, so as to aid in combustion, and especially in such a construction of the parts of the device as will admit of its being easily and readily applied to any steam-boiler, as will be hereinafter fully set forth and claimed.

In the accompanying drawings, forming a part of this specification, Figure 1 represents a sectional side elevation of the invention as applied to an ordinary steam-boiler; Fig. 2, a front elevation of a boiler-front having single doors; Fig. 3, a similar sectional view of a double front; Fig. 4, a longitudinal section of the steam-nozzle; and Fig. 5, an end View of the same,one half of the outer shellbeing removed.

Similar letters of reference indicate corresponding parts.

3 5 The invention is quite simple, and, as stated above, is capable of being applied to any ordinary steam-boiler without previous prepara tion of the walls or front of the furnace.

Referring to the drawings, A is the furnace- 0 front; B, the firedoor; O, a steanrpipe communicating with the steam-dome D, and passing through the boiler-front and stack E.

F is the door to the ash-pit. The steam is introduced into the combustion-chamber from the front of the furnace, as will be seen, and this constitutes one of the important features of my invention. In practice I prefer, where the nature of the furnacefront will admit of it, to place the steam noz- Serial No. 223,219. (No model.)

zle in the middle of the furnace-front, and in all cases to set it near the bottom of the boiler,

as shown. WVhen, as in the case of the con- :struction indicated in Fig. 3, the front has a central stanchion and double doors, I divide the jet and injectitthrough two nozzles placed 5 5 over the respective doors. In this case it is desirable to govern the flow of steam by a single cock, so that the quantity admitted through each nozzle shall be practically the same and a uniformity of action take place in each side of the combustion-chamber.

My object in setting the nozzle high is to throw the steam along the bottom of the boiler, rather than into the bed of fuel, and by inducing combustion here intensify the action of 6 the furnace upon the boiler. I find, also, that the position of this nozzle has much to do with the more or less complete combustion of the fuel, and that when placed high, as shown, the result is more satisfactory than when set lower.

The principal advantage to be gained by in jecting the steam from the front is the aid which such an arrangement gives to the draft, though its position in this regard seems also to assist more than any other in the combustion of the fuel. Taken in connection with other features of the invention, I regard it necessary that the steam should flow into the combustionehamber from this direction. It will be seen that in the fire-doors B B are small holesb b,through which live air from the boilerroom is admitted directly to the combustion chamber. It will also be seen that no damper is made in thelower doors, which may remain 8::

quite closed at all times without unduly checking the draft, as it is the intention tosupply air only to the fire above the grates. The aid given to such draft by the rush of steam will be apparent, while the suppression of draft 0 through the bed of the fire tends to retard the separation of unconsumed particles from the fuel. The effect is also to more quickly coke the surface 'of the fire and attain the same end by this means. Besides the live air admitted through the holes in the upper doors, the principal object of which is to supply the oxygen necessary to the combustion of the fuel itself, I also admit a current of air in close proximity to the jet of steam, the oxygen of which air sustains the combustion of the hydrogen of the steam. This I do by means of a tube, a, surrounding the nozzle andI provide for the free passage of the air by flaring the ends of the tube, as shown.

In Fig. at is shown the detail of the nozzle. This is in the nature ,of the nozzle used for clearing out fines, being a hollow head attached to the pipe 0, and provided with a spirally-grooved plug, f e, the effect of which is to project the escaping steam in a widelydiffused spray. A central orifice, e, secures a uniform distribution of the steam in front of the nozzle. For convenience in applying it to the hole in the furnace-front, the outer shell, a, is made in two parts, which are fastened at the middle with suitable bolts. The nozzle is retained central to the shell by means of the set-screws d d d.

I consider it desirable, though not of the highest importance, that the steam be somewhat superheated in its passage from theboiler to the fire, and to this end I run the pipe through the stack and boiler-front, as shown.

Thus constructed, the invention is very cheap, compared with most smoke-consumers, and is easily and readily applicable to boilers for which no provision has been made to this end in their original construction. In practice it has been found to effect a practically complete combustion of the worst qualities of bituminous coal, and to considerably increase the steam generating capacity of a given quantity thereof.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is

I. In a smoKe-consumlng furnace, the cum- 4.0 bination of the perforated front of the combustion-chamber, the steam-pipe G, and the nozzle 0, having in its enlarged discharge end a plug spirally grooved on the periphery and provided with a direct central hole, whereby the central portion of the steam in the pipe is projected straight forward over the fire and the outer portions thereof at varying tangents, for the better diffusion thereof, substantially as set forth.

2. In a smoke-consuming furnace, the combination of the furnace-front, the described steam-nozzle having in its enlarged discharge end a plug spirally grooved on the periphery and provided with a direct central hole,and the bell-mouthed shell inclosing said'nozzle, having set-screws for adjusting said nozzle central to said shell, substantially as set forth.

3. The combination, in a smoke-consuming furnace, of the described steam-nozzle having in its enlarged discharge end a plug spirally grooved on the periphery and provided with a direct central hole, the furnace-front, and the shell or tube inclosing said nozzle, said shell having set-screws for centrally adjusting 6 the nozzle and being bell-mouthed, composed of two or more parts and joined at the middle and smaller portion, substantially as and for the purpose set forth.

In testimony whereof I affix my signaturein 7o presence of two witnesses.

GEORGE F. TINKHAM.

Witnesses:

A. M. PHELPS, FRANK G. CLARK. 

